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Finding the Fourth Proportional to 1,391.42, 2,086.32 and 525.80

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Solution

The fourth proportional to 1,391.42, 2,086.32 and 525.80 is: 788.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.42 : 2,086.32 = 525.80 : x
  2. Step 2: Convert to fraction form
    1,391.42/2,086.32 = 525.80/x
  3. Step 3: Cross multiply
    1,391.42x = 2,086.32 × 525.80
  4. Step 4: Simplify right side
    1,391.42x = 1,096,987.06
  5. Step 5: Solve for x
    x = 1,096,987.06/1,391.42
  6. Step 6: Final answer
    x = 788.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.